package com.heima.article.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.spring.util.ObjectUtils;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.IService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.article.mapper.ApArticleConfigMapper;
import com.heima.article.mapper.ApArticleContentMapper;
import com.heima.article.mapper.ApArticleMapper;
import com.heima.article.mess.ArticleVisitStreamMess;
import com.heima.article.service.ApArticleService;
import com.heima.article.service.ArticleFreemarkerService;
import com.heima.common.commons.ArticleConstants;
import com.heima.common.commons.CacheService;
import com.heima.model.article.dtos.ArticleDto;
import com.heima.model.article.dtos.ArticleHomeDto;
import com.heima.model.article.pojos.ApArticle;
import com.heima.model.article.pojos.ApArticleConfig;
import com.heima.model.article.pojos.ApArticleContent;
import com.heima.model.article.vo.HotArticleVo;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import io.swagger.models.auth.In;
import org.checkerframework.checker.units.qual.A;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.util.Comparator;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class ApArticleServiceImpl extends ServiceImpl<ApArticleMapper, ApArticle> implements ApArticleService {
    @Autowired
    ApArticleMapper apArticleMapper;
    private static final  Integer  MAX_PAGE_SIZE = 50;

    @Autowired
    private ApArticleConfigMapper apArticleConfigMapper;

    @Autowired
    private ApArticleContentMapper apArticleContentMapper;
    @Autowired
    private ArticleFreemarkerService articleFreemarkerService;
    @Override
    public ResponseResult loadArticleList(ArticleHomeDto dto, Short type) {
        //校验数据
//        size
        Integer size = dto.getSize();
        if (0 == size || null == size){
                size = 10;
        }
        //用于获取a和b之间最小的数，此处使size大小最大为50条
        Math.min(size,MAX_PAGE_SIZE);
        dto.setSize(size);
        //tag,用来判断是加载更多还是最新
        if(!type.equals(ArticleConstants.LOADTYPE_LOAD_MORE)&&!type.equals(ArticleConstants.LOADTYPE_LOAD_NEW)){
            type = ArticleConstants.LOADTYPE_LOAD_MORE;
        }
//        判断标题
        if (StringUtils.isEmpty(dto.getTag())){
            dto.setTag(ArticleConstants.DEFAULT_TAG);
        }
//        判断时间是否赋值
        if(dto.getMaxBehotTime() == null) dto.setMaxBehotTime(new Date());
        if(dto.getMinBehotTime() == null) dto.setMinBehotTime(new Date());

        // 调用mapper层获取数据返回
        List<ApArticle> apArticles = apArticleMapper.loadArticleList(dto, type);
        return ResponseResult.okResult(apArticles);
    }

    @Override
    public ResponseResult saveArticle(ArticleDto dto) {
        //1.检查参数
        if (dto == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        ApArticle apArticle = new ApArticle();
        BeanUtils.copyProperties(dto, apArticle);

        //2.判断是否存在id
        if (dto.getId() == null) {
            //2.1 不存在id  保存  文章  文章配置  文章内容
            //保存文章
            save(apArticle);
            //保存配置
            ApArticleConfig apArticleConfig = new ApArticleConfig(apArticle.getId());
            apArticleConfigMapper.insert(apArticleConfig);
            //保存文章内容
            ApArticleContent apArticleContent = new ApArticleContent();
            apArticleContent.setArticleId(apArticle.getId());
            apArticleContent.setContent(dto.getContent());
            apArticleContentMapper.insert(apArticleContent);
        }else {
            //2.2 存在id   修改  文章  文章内容
            //修改  文章
            updateById(apArticle);
            //修改内容
            ApArticleContent apArticleContent = apArticleContentMapper.
                    selectOne(Wrappers.<ApArticleContent>lambdaQuery().eq(ApArticleContent::getArticleId, dto.getId()));
            apArticleContent.setContent(dto.getContent());
            apArticleContentMapper.updateById(apArticleContent);
        }
        //异步调用 生成静态文件上传到minio中
        articleFreemarkerService.buildArticleToMinIO(apArticle,dto.getContent());
        //3.结果返回  文章的id
        return ResponseResult.okResult(apArticle.getId());
    }
    @Autowired
    CacheService cacheService;
    @Override
    public ResponseResult load2(ArticleHomeDto dto, Short type, boolean firstPage) {
        if (firstPage){
            String jsonstr = cacheService.get(ArticleConstants.HOT_ARTICLE_FIRST_PAGE + dto.getTag());
            if (!StringUtils.isEmpty(jsonstr)){
                List<HotArticleVo> hotArticleVoList = JSONArray.parseArray(jsonstr, HotArticleVo.class);
                ResponseResult responseResult = ResponseResult.okResult(hotArticleVoList);
                return  responseResult;
            }
        }
        return loadArticleList(dto,type);
    }
    /**
     * 更新文章的分值  同时更新缓存中的热点文章数据
     * @param mess
     */
    @Override
    public void updateScore(ArticleVisitStreamMess mess) {
        //1.更新文章的阅读、点赞、收藏、评论的数量
        ApArticle apArticle =  updateArticle(mess);
        //2.计算文章的分值
        Integer score = computeScore(apArticle);
        score = score * 3;
        //3.替换当前文章对应频道的热点数据
        replaceDataToRedis(apArticle, score, ArticleConstants.HOT_ARTICLE_FIRST_PAGE + apArticle.getChannelId());
        //4.替换推荐对应的热点数据
        replaceDataToRedis(apArticle, score, ArticleConstants.HOT_ARTICLE_FIRST_PAGE + ArticleConstants.DEFAULT_TAG);
    }

    private void replaceDataToRedis(ApArticle apArticle, Integer score, String s) {
        //拿到原有频道的缓存数据
        String articleListStr = cacheService.get(s);
        if (!StringUtils.isEmpty(articleListStr)) {
            List<HotArticleVo> hotArticleVoList = JSON.parseArray(articleListStr, HotArticleVo.class);
            boolean flag = true;
            //如果缓存中存在该文章，只更新分值
            for (HotArticleVo hotArticleVo : hotArticleVoList) {
                if (hotArticleVo.getId().equals(apArticle.getId())){
                    hotArticleVo.setScore(score);
                    flag = false;
                    break;
                }
            }
            //如果缓存中不存在，查询缓存中分值最小的一条数据，进行分值的比较，如果当前文章的分值大于缓存中的数据，就替换
            if (flag){
                if (hotArticleVoList.size() >= 30){
                    hotArticleVoList = hotArticleVoList.stream().sorted(Comparator.comparing(HotArticleVo::getScore).reversed()).collect(Collectors.toList());
                    HotArticleVo lastvo = hotArticleVoList.get(hotArticleVoList.size() - 1);
                    if (lastvo.getScore()<score){
                        hotArticleVoList.remove(lastvo);
                        HotArticleVo hotArticleVo = new HotArticleVo();
                        BeanUtils.copyProperties(apArticle,hotArticleVo);
                        hotArticleVo.setScore(score);
                        hotArticleVoList.add(hotArticleVo);
                    }

                }else {
                    HotArticleVo hotArticleVo = new HotArticleVo();
                    BeanUtils.copyProperties(apArticle,hotArticleVo);
                    hotArticleVo.setScore(score);
                    hotArticleVoList.add(hotArticleVo);
                }
            }
            //缓存到redis
            hotArticleVoList =  hotArticleVoList.stream().sorted(Comparator.comparing(HotArticleVo::getScore).reversed()).collect(Collectors.toList());
            cacheService.set(s, JSON.toJSONString(hotArticleVoList));
        }

    }

    private ApArticle updateArticle(ArticleVisitStreamMess mess) {
        ApArticle apArticle = getById(mess.getArticleId());
        apArticle.setCollection(apArticle.getCollection()==null?0:apArticle.getCollection()+mess.getCollect());
        apArticle.setComment(apArticle.getComment()==null?0:apArticle.getComment()+mess.getComment());
        apArticle.setLikes(apArticle.getLikes()==null?0:apArticle.getLikes()+mess.getLike());
        apArticle.setViews(apArticle.getViews()==null?0:apArticle.getViews()+mess.getView());
        updateById(apArticle);
        return apArticle;
    }
    private Integer computeScore(ApArticle apArticle){
        Integer score = 0;
        if(apArticle.getLikes() != null){
            score += apArticle.getLikes() * ArticleConstants.HOT_ARTICLE_LIKE_WEIGHT;
        }
        if(apArticle.getViews() != null){
            score += apArticle.getViews();
        }
        if(apArticle.getComment() != null){
            score += apArticle.getComment() * ArticleConstants.HOT_ARTICLE_COMMENT_WEIGHT;
        }
        if(apArticle.getCollection() != null){
            score += apArticle.getCollection() * ArticleConstants.HOT_ARTICLE_COLLECTION_WEIGHT;
        }

        return score;
    }
}
